I bought a "refurbished" 608 last December, and have been enjoying it for almost a year...until recently. I have started hearing a loud "pop" through the speakers intermittently while watching video. It even happens when there is no active playback....just sitting at the menu screen of my blu-ray player. Let me describe my setup briefly:
Onkyo TX-SR608 Receiver
Infinity Primus P162 (FL FR), PC350 (Center), P152 (RL RR)
Samsung LN46B750 TV
Samsung BD-C5500 Blu-Ray Player
Everything is connected via HDMI
This issue seems to happen most often when I am using Dolby PL2 TV Logic surround mode, and in THIS mode the popping seems to come from the front speakers...maybe the center channel more specifically...
I tried all-channel stereo last night while watching netflix, and I could here the popping come from the rear speakers as well.
I recently watched a DVD using the T-D mode, and I don't think there was any popping.
Could this be as simple as a loose speaker wire? If there is a possibility it is the receiver, I need to know quickly so I can get it looked at within the warranty window.